Seeking CAT6 RJ45 Socket with Disconnector

Does anyone have a source for an RJ45 socket that disconnects an outgoing line when a jack is plugged in? This would be similar to a headphone jack disconencting the speakers.

The RJ45 is running a quazi POE (Power Over Ethernet), so I need to disconnect pins 4 and 5 at a bare minimum (V+), preferably 1, 2, 3 and 6 also (Comms). 7 and 8 are GND.

The socket is for a display device, so the plan is with nothing plugged in, the CAT6 cable continues on its path to the primary disaply, mounted on the deadfront of an outside panel. If the operator plugs his remote display in so he can work from his truck and stay out of the snow, I need to avoid data conflicts with the two displays, so the primary disaplay needs to be disconnected. These are hot-swappable.

I know, a hub or similar would do the trick, but that requires PCB changes = $$$$ + time.

Thanks for your help, please post links to data sheets and suppliers, budgetary pricing etc.